I been using two years my Nest Mini but recenly I change the WI-FI of my home and now I can not reconfigure the Nest Mini. I try everything, try different routers, connect with the WI-FI of another phone...
In my house I have Google Home Mini first generation that works fine.
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I always get the this message after Nest Mini connects with the WI-FI
"Your Nest Mini has been set up successfully but we can't detect it. Check that your mobile device and your Nest Mini are connected to the same WI-FI network. Disable access point isolation If this feature is enabled on your WI-FI router, you will need to disable it. More information"
Did you disable Access Point Isolation on your Wi-Fi router/modem, as indicated in the message?
Did you do a factory reset of your Nest Mini, to clear the Wi-Fi settings?